体绘制技术在医学可视化中的新发展

科学计算可视化体绘制算法能反映出体数据的内部信息，在医学，它已经从辅诊断发展成为辅助治疗的重要手段，体可视化技术是医学可视化的重要研究内容，其处理过程包括体数据的获取，模型的建立，数据的映射，绘制等操作，该文介绍了医学可视化中常使用的几种光照模型，针对基于图象空间和对象空间两种体绘制算法，介绍了它们的基本思想方法，并详细阐述了在近期的主要加速技术和提高图象质量方法的新进展，最后给出了实验数据和结论。

The New Development of Volume Rendering Technology in Medical Visualization

Volume visualization is a method of extracting meaningful information from volume data using interactive graphics and imaging, and it is concerned with volume data representation, modeling, manipulation, and rendering. Medical visualization, one of the most successful scientific visualization research and fields, is heading from diagnosis assistance toward treatment assistance. The aim of volume visualization in medicine is to create accurate realistic views of objects from medical data. The process of volume visualization technology includes data caching, model creating, data mapping, rendering and so on. There are two methods in volume visualization: surface rendering and volume rendering. The intermediate surface representation is used in surface rendering technique. The surface information is fast represented, but the inner information is not displayed. Volume data are directly represented in volume rendering technique, so the inner information can be displayed. The primary illumination models in medical visualization and the basic ideas of various algorithms in image space and object space of volume rendering technique are introduced. The methods for accelerating processing and improving image quality at present are discussed in detail. Some experimental data and results are presented in the end.